Which are 'real' erasers?

There's only a distinction between the two types of slime and wraith erasers. There are no fake versions of the other erasers unless you want to count the fire raccoon eraser, which doesn't do anything yet. For the slime and wraith erasers, the ones that only say "An eraser shaped as the wraith/slime" are fake. You'll want to shoot for the ones that say roughly "An eraser shaped like a wraith/slime. There are five other erasers with different shapes and forms. Try to collect them all!" Basically, the real ones are the ones with the longer descriptions. I doubt you'll be able to find a real wraith/slime eraser under 50k nx if at all. They're pretty much nonexistant now.

Oh, and you can use maple points in MTS? O.o